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Name:  2-Hydroxyterephthalic acid

Other name: 1,4-Benzenedicarboxylic acid, 2-hydroxy-;

2-hydroxybenzene-1,4-dicarboxylic acid;

2-Hydroxy-1,4-benzenedicarboxylic acid;

2-Hydroxyterephthals?ure;

Acide 2-hydroxytéréphtalique;

2-hydroxy terephthalic acid;

2-Hydroxybenzene-1,4-dicarboxylic acid, 2,5-Dicarboxyphenol;

terephthalic acid, hydroxy-;

Hydroxyterephthalic acid;

CAS NO: 636-94-2

EINECS:N/A

MF: C8H6O5

MW: 182.130

MP: 312-317?C

BP: 436.9±40.0 °C at 760 mmHg

Density: 1.6±0.1 g/cm3

Appearance: Yellow powder

Purity: 98%

Package: 25g, 100g, 500g, bulk package

Application: Pharmaceutical intermediate

2-hydroxyterephthalic acid (HTA) CAS NO: 636-94-2 was synthesized by modified Koble-Schmitt atmospheric carboxylation method.and refined.The new synthesis method was compared with 2-bromoterephthalic acid(BTA)catalytic hydrolysis.The results showed that crude product HTA with purity of 90% was prepared from HBA by CO2 atmospheric carboxylation for 6 h at 230—240 ℃ in the presence of K2CO3 and potassium formate solvent,and purified through two times acid-alkali refining to obtain polymerization-grade HTA CAS NO: 636-94-2 with high-purity of 99.5 % and metal ions of below 50 mg/kg,total yield of above 56%(base on HBA ,CAS NO: 636-94-2).The prepared HTA CAS NO: 636-94-2 was identified by FT-IR and MS,and the process had the advantages of atmospheric carboxylation,convenient operation,excellent product quality,good economy and easy commercialization.The prepared HTA could provide the raw material for new high-preformance materials modified with hydroxy group and new monomers.

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